The Thule Low-Rider is a rugged fork mount block for your bicycle. Mount it anywhere you want an easy way to carry one bike, including your truck bed or trailer deck. The standard Low-Rider fork block has a base plate with 4 pre-drilled holes, so you can install it on virtually any flat surface with your choice of hardware. 9mm quick-release skewer. Backed by Thule's Lifetime Warranty. Manufacturer's part number: 821